You should not want to lose "weight." Rather, you should desire the loss of fat. And you can't simply ask, "if I box and skip, will I lose fat." Sure, they can be cardiovascular activities that burn enough calories to aid in fat loss. However, this won't happen if you are not eating correctly and doing the other aspects of healthy living properly.
Eat right, perform cardio, lift weights, drink plenty of water, rest. There is a whole lot that goes into it.
I suggest reading up on some of the posts to build a base of knowledge to start with.